$box-shadow-degrees: (
  0: 0,
  6: 2,
  30: 5,
  60: 5
) !default;

@each $size, $offset in $box-shadow-degrees {
  .shadow-#{$size} {
    box-shadow: 0 #{$offset}px #{$size}px 0 rgba($black, 0.05 * $offset);
  }
}
